The sound is great! The bass is much stronger than I expected. They are passive now. In the end I didn't put the hypex in these. I just have an ordinary NAD amp driving the Seas elements. They are quite sensitive though so 25% all ready start to hurt my ears. I haven't done any measurements yet. Also I have the opening full open in the back. I need to find some good material to play when I start tuning.

I measured the ZOB yesterday with a borrowed kit for measuring speakers. The software I used was HOLMImpulse. The microphone was a Dayton EMM-6. HOLMImpulse reads the calibration file for the microphone so it should be out of the measurement. The amp, speaker and microphone where connected to a "red box" that I was told should take the amp out of the measurement too.

That leaves the DAC and the speaker and the room. The DAC was a M-Audio Transit and the room a normal living room.

The blue line was measured 4 inch from the element.The red line was measured i our sofa by my right ear.THe green line was measured at the port opening at the back of the speaker.

Wow, great job! Very impressive, especially the measurements. It's excellent to see other peoples measurements and how they compare. My measurements of the ZOB were done with the FRX drivers and the response you've gotten is amazingly similar. It shows how much a cabinet actually effects the response of a given driver.

Here is the FRX response in the ZOB in our listening room.

What is probably more fascinating is comparing your response to the published response of the SEAS driver:

I started to look at the measuremnet of the FRX you posted and started to see more and more similarities.

I couldn't keep my self from editing the measurements on top of each other. I scaled the axes so they were the same and shifted up your entire measurement a bit. I also did the 1/12 ocatave smoothing om my measurement. As a curiosity in red color I loaded an old measurement of the plywood baffle seen in the beginning of this thread .

By the way, I do not know how much power I was taking out of my amp when I was making my measurement. The volume was high. I did wear ear protection, but I'd say that it was still at party listening level (whatever that means).

Thank you for the posts on your project! I have been researching OB with a focus on Steve's of course and this is great material. You made some great looking speakers and I am glad they sound good and work in your room. Keep us posted and yes I think Steve's 2 watter will do great on your speakers.